In iOS when I press share and then press more instead of copy link (which I did to select the shortcut) it copies a different kind of URL that breaks the shortcut. This kind of url puts the video identifier after the ? Along with the share id https://youtube.com/watch?v=
Wow I really messed that up. Let me fix. “Share > More” works with recorded live streams (which is what I was testing) but not regular videos.
Fixed, use this new one: https://www.icloud.com/shortcuts/1fad7b3bc154402f9b210b26d7b7a542 Thanks for finding that bug!